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Author : John Henry Gruenewald
Release : 2017
Genre :
Kind : eBook
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Book Synopsis Tuning the Effective Electron Correlation in Iridate Systems Featuring Strong Spin-orbit Interaction by : John Henry Gruenewald
Download or read book Tuning the Effective Electron Correlation in Iridate Systems Featuring Strong Spin-orbit Interaction written by John Henry Gruenewald. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Martin Ellguth
Release : 2015-06-15
Genre : Science
Kind : eBook
Book Rating : 024/5 ( reviews)
Book Synopsis A spin- and momentum-resolved photoemission study of strong electron correlation in Co/Cu(001) by : Martin Ellguth
Download or read book A spin- and momentum-resolved photoemission study of strong electron correlation in Co/Cu(001) written by Martin Ellguth. This book was released on 2015-06-15. Available in PDF, EPUB and Kindle. Book excerpt: Electron correlation is an important phenomenon of solid-state physics, which is actively studied both by experimentalists for the rich material properties which result from it and by theoreticians which face a lot of open questions on the way to a succesful many-body description of electron systems where the Coulomb interaction plays an important role. Ferromagnetic cobalt is an interesting candidate for the study of electron correlation, since the exchange interaction splits the band structure into majority-spin and minority-spin bands, which differ considerably in the strength of the electron-electron interaction.Using a revolutionary, parallelized approach to spin-resolved photoemission with an efficiency 3 to 4 orders of magnitude higher than previously possible, the spin-dependent manifestations of the electron correlation are revealed in unprecedented detail, allowing for a characterization of the self energy. As an additional phenomenon of the electron correlation, unusual waterfall features, previously only observed in superconductors, occur in the photoemission spectra of cobalt. Further subjects include a comprehensive mapping of the fcc cobalt Fermi surface and an investigation of unoccupied quantum well states in ultrathin cobalt films on copper accessed by spin-resolved, non-linear photoemission. The principle of the imaging spin filter and the data analysis routine are discussed in-depth in a dedicated chapter.
Author :
Release : 2015
Genre :
Kind : eBook
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Book Synopsis Interplay of Spin-orbit Coupling and Electron Correlations in Iridate Compounds by :
Download or read book Interplay of Spin-orbit Coupling and Electron Correlations in Iridate Compounds written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mario Francisco Borunda Bermudez
Release : 2010
Genre :
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Book Synopsis Topics in Two-dimensional Systems with Spin-orbit Interaction by : Mario Francisco Borunda Bermudez
Download or read book Topics in Two-dimensional Systems with Spin-orbit Interaction written by Mario Francisco Borunda Bermudez. This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on the study of spin-dependent transport in systems with strong spin-orbit coupling within their band structure. In particular we focus on the anomalous Hall effect, the spin Hall effect, and the Aharonov-Casher effect whose origins, are linked to the presence of spin-orbit coupling. Given the theoretical controversy surrounding these effects we further simplify our studies to semiconductor systems where the band structure is much simpler than in metallic systems with heavy elements. To obtain finite analytical results we focus on reduced dimensions (two and one dimensions) which can be explored experimentally. To set the stage, we discuss the origins of the strong spin-orbit coupling in semiconductors deriving the effective interaction from the Dirac equation. We discuss in detail the skew scattering contribution to the anomalous Hall effect in two-dimensional systems, which is dominant for systems with low impurity concentrations, and find that it is reduced when the two chiral subbands are partially occupied in an electron gas and vanishes for a hole gas, regardless of the band filling. We also present calculations for all contributing mechanisms. We propose a device to test this prediction and study the crossover from the intrinsic to the extrinsic anomalous Hall effect. We calculate all contributions to the anomalous Hall effect in electron systems using the Kubo-Streda formalism. We find that all contributions vanish when both subbands are occupied and that the skew scattering contribution dominates when only the majority subband is occupied. We calculate the interference effects due to spin-orbit interaction in mesoscopic ring structures patterned from HgTe quantum wells related to the Aharonov-Casher effect and the spin Hall effect. We find that the transport properties are affected by the carrier density as well as the spin orbit interaction. We find that the conductivity is larger in hole gas systems. We also show that devices with inhomogenous spin orbit interaction exhibit an electrically controlled spin-flipping mechanism.
Author : Gang Cao
Release : 2021-06-14
Genre : Science
Kind : eBook
Book Rating : 510/5 ( reviews)
Book Synopsis Physics of Spin-Orbit-Coupled Oxides by : Gang Cao
Download or read book Physics of Spin-Orbit-Coupled Oxides written by Gang Cao. This book was released on 2021-06-14. Available in PDF, EPUB and Kindle. Book excerpt: This book is aimed at graduate students, post docs and senior researchers with preliminary expertise in materials physics or chemistry, and with an interest in the physical and chemical properties of 4d- and 5d transition metal oxides, especially ruthenates and iridates. The 4d- and 5d-transition metal oxides are among the most current and interesting quantum materials. This book reviews recent experimental and theoretical evidence that the physical and structural properties of these materials are decisively influenced by strong spin-orbit interactions that compete with comparable Coulomb, magnetic exchange and crystalline electric field interactions. This competition often leads to unusual ground states and magnetic frustration that are unique to this class of materials. Novel coupling between the orbital/lattice and spin degrees of freedom, which seriously challenge current theoretical models and are not addressed by traditional textbooks, are of particular interest, This book also reviews a few techniques for single-crystal growth that are most suitable for the 4d- and 5d-transition metal oxides. The discussion is intended to help fill an existing void in the literature describing relevant synthesis techniques for 4d- and 5d-materials, which is a daunting experimental challenge.
